diff --git a/.gitignore b/.gitignore
index 703984b..a82918b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,4 +2,4 @@
 
 /composer.lock
 /config.json
-/.block
\ No newline at end of file
+/.state
\ No newline at end of file
diff --git a/README.md b/README.md
index 9e03750..98196e1 100644
--- a/README.md
+++ b/README.md
@@ -10,4 +10,5 @@
 * `cd crawler`
 * `cp example/config.json config.json`
 * `crontab -e`:`* * * * * php kvazar/crawler/src/index.php`
-  * drop index: `php kvazar/crawler/src/index.php drop`
\ No newline at end of file
+  * drop index: `php kvazar/crawler/src/index.php drop`
+  * optimize index: `php kvazar/crawler/src/index.php optimize`
\ No newline at end of file
diff --git a/src/index.php b/src/index.php
index f3a0f7d..e76c21a 100644
--- a/src/index.php
+++ b/src/index.php
@@ -2,7 +2,7 @@
 
 // Prevent multi-thread execution
 $semaphore = sem_get(
-    crc32(__DIR__), 1
+    crc32(__FILE__), 1
 );
 
 if (false === sem_acquire($semaphore, true))
@@ -26,21 +26,21 @@ $config = json_decode(
     )
 );
 
-// Init block
-$block = 0;
+// Init current block state
+$state = 1;
 
-if (file_exists(__DIR__ . '/../.block'))
+if (file_exists(__DIR__ . '/../.state'))
 {
-    $block = (int) file_get_contents(
-        __DIR__ . '/../.block'
+    $state = (int) file_get_contents(
+        __DIR__ . '/../.state'
     );
 }
 
 else
 {
     file_put_contents(
-        __DIR__ . '/../.block',
-        $block
+        __DIR__ . '/../.state',
+        $state
     );
 }
 
@@ -115,11 +115,27 @@ if (isset($argv[1]))
                 true
             );
 
+            file_put_contents(
+                __DIR__ . '/../.state',
+                1
+            );
+
             exit(
                 _('Index dropped!')
             );
 
         break;
+
+        // Index optimization request
+        case 'optimize':
+
+            $index->optimize();
+
+            exit(
+                _('Index optimized!')
+            );
+
+        break;
     }
 }
 
@@ -131,16 +147,262 @@ if (false === $blocks = $kevacoin->getBlockCount())
     );
 }
 
-for ($i = $block; $i <= $blocks; $i++)
+for ($block = $state; $block <= $blocks; $block++)
 {
+    // Debug progress
     echo sprintf(
         "%d/%d\r",
-        $i,
+        $block,
         $blocks
     );
 
+    // Get block hash
+    if (!$hash = $kevacoin->getBlockHash($block))
+    {
+        exit(
+            sprintf(
+                _('Could not receive "%d" block hash!'),
+                $block
+            )
+        );
+    }
+
+    // Get block data
+    if (!$data = $kevacoin->getBlock($hash))
+    {
+        exit(
+            sprintf(
+                _('Could not receive "%d" block data by hash "%s"!'),
+                $block,
+                $hash
+            )
+        );
+    }
+
+    if (!isset($data['tx']))
+    {
+        exit(
+            sprintf(
+                _('Could not receive tx data in block "%d"!'),
+                $transaction,
+                $block
+            )
+        );
+    }
+
+    // Process each transaction in block
+    foreach ((array) $data['tx'] as $transaction)
+    {
+        // Validate each transaction
+        if (!$raw = $kevacoin->getRawTransaction($transaction))
+        {
+            exit(
+                sprintf(
+                    _('Could not receive raw transaction "%s" in block "%d"!'),
+                    $transaction,
+                    $block
+                )
+            );
+        }
+
+        if (empty($raw['txid']))
+        {
+            exit(
+                sprintf(
+                    _('Could not receive txid of transaction "%s"  in block "%d"!'),
+                    $transaction,
+                    $block
+                )
+            );
+        }
+
+        if (!isset($raw['vout']))
+        {
+            exit(
+                sprintf(
+                    _('Could not receive vout of transaction "%s" in block "%d"!'),
+                    $transaction,
+                    $block
+                )
+            );
+        }
+
+        if (empty($raw['time']))
+        {
+            exit(
+                sprintf(
+                    _('Could not receive time of transaction "%s"  in block "%d"!'),
+                    $transaction,
+                    $block
+                )
+            );
+        }
+
+        if (empty($raw['size']))
+        {
+            exit(
+                sprintf(
+                    _('Could not receive size of transaction "%s"  in block "%d"!'),
+                    $transaction,
+                    $block
+                )
+            );
+        }
+
+        // Parse transaction data
+        foreach((array) $raw['vout'] as $vout) {
+
+            if (!$vout || empty($vout['scriptPubKey']) || empty($vout['scriptPubKey']['asm']))
+            {
+                exit(
+                    sprintf(
+                        _('Invalid vout transaction "%s" in block "%d"!'),
+                        $transaction,
+                        $block
+                    )
+                );
+            }
+
+            // Parse space-separated fragments to array
+            $asm = explode(
+                ' ',
+                $vout['scriptPubKey']['asm']
+            );
+
+            // Get operation ID required to continue
+            if (empty($asm[0]))
+            {
+                exit(
+                    sprintf(
+                        _('Undefined operation of transaction "%s" in block "%d"!'),
+                        $transaction,
+                        $block
+                    )
+                );
+            }
+
+            // Detect key / value
+            switch ($asm[0]) {
+
+                case 'OP_KEVA_PUT':
+
+                    if (empty($asm[1]) || empty($asm[2]) || empty($asm[3]))
+                    {
+                        exit(
+                            sprintf(
+                                _('Undefined namespace or key or value of transaction "%s" in block "%d"!'),
+                                $transaction,
+                                $block
+                            )
+                        );
+                    }
+
+                    $namespace = \Kvazar\Crypto\Base58::encode(
+                        $asm[1], false, 0, false
+                    );
+
+                    $key = \Kvazar\Crypto\Kevacoin::decode(
+                        $asm[2]
+                    );
+
+                    $value = \Kvazar\Crypto\Kevacoin::decode(
+                        $asm[3]
+                    );
+
+                break;
+
+                case 'OP_KEVA_DELETE':
+
+                    if (empty($asm[1]) || empty($asm[2]))
+                    {
+                        exit(
+                            sprintf(
+                                _('Undefined namespace or key of transaction "%s" in block "%d"!'),
+                                $transaction,
+                                $block
+                            )
+                        );
+                    }
+
+                    $namespace = \Kvazar\Crypto\Base58::encode(
+                        $asm[1], false, 0, false
+                    );
+
+                    $key = \Kvazar\Crypto\Kevacoin::decode(
+                        $asm[2]
+                    );
+
+                    $value = '';
+
+                break;
+
+                case 'OP_KEVA_NAMESPACE':
+
+                    if (empty($asm[1]) || empty($asm[2]))
+                    {
+                        exit(
+                            sprintf(
+                                _('Undefined namespace or value of transaction "%s" in block "%d"!'),
+                                $transaction,
+                                $block
+                            )
+                        );
+                    }
+
+                    $namespace = \Kvazar\Crypto\Base58::encode(
+                        $asm[1], false, 0, false
+                    );
+
+                    $key = '_KEVA_NS_';
+
+                    $value = \Kvazar\Crypto\Kevacoin::decode(
+                        $asm[2]
+                    );
+
+                break;
+
+                case 'OP_HASH160': // @TODO not in use at this moment
+
+                    /*
+                    [0] => OP_HASH160
+                    [1] => d03b0c06f8db322a2365e41385f2c8f6f89eebe3
+                    [2] => OP_EQUAL
+                    */
+
+                    continue 2;
+
+                break;
+
+                case 'OP_RETURN': // @TODO not in use at this moment
+
+                    /*
+                    [0] => OP_RETURN
+                    [1] => aa21a9ede2f61c3f71d1defd3fa999dfa36953755c690689799962b48bebd836974e8cf9
+                    */
+
+                    continue 2;
+
+                break;
+
+                default:
+
+                    exit(
+                        sprintf(
+                            _('Undefined operation "%s" of transaction "%s" in block "%d"!'),
+                            $asm[0],
+                            $transaction,
+                            $block
+                        )
+                    );
+            }
+
+            // Add index record @TODO
+        }
+    }
+
+    // Update current block indexed
     file_put_contents(
-        __DIR__ . '/../.block',
-        $i
+        __DIR__ . '/../.state',
+        $block
     );
 }
\ No newline at end of file